2 problems: potential erg & tension/friction

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Homework Help Overview

The discussion revolves around two physics problems related to potential energy and tension/friction. Participants are examining their approaches to solving these problems and verifying calculations.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants are sharing their attempts at solutions, with some verifying calculations and discussing methods used to arrive at their answers. There is a focus on checking numerical results and understanding the application of formulas.

Discussion Status

Some participants have provided feedback on the correctness of specific answers, while others are seeking verification of their calculations. There is an ongoing exchange of insights regarding the methods used, but no consensus has been reached on all aspects of the problems.

Contextual Notes

Participants are working within the constraints of homework rules, which may limit the extent of guidance provided. There are indications of potential misunderstandings in the application of formulas, particularly in relation to the manipulation of terms in equations.

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Homework Statement


Question1.jpg

http://i754.photobucket.com/albums/xx183/reddiesel08/Question1.jpg
Question2.jpg

http://i754.photobucket.com/albums/xx183/reddiesel08/Question2.jpg

2. The attempt at a solution
Attempt2.jpg

http://i754.photobucket.com/albums/xx183/reddiesel08/Attempt2.jpg
Attempt.jpg

http://i754.photobucket.com/albums/xx183/reddiesel08/Attempt.jpg

Need someone to check my work and help solve these two problems, thanks in advance to anyone willing to help.
 
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5 is correct, but I did not check the numbers for this one.

7, your method is correct, but your final answer is off. My calculator gives me vi = 4.76 m/s
 
rock.freak667 said:
5 is correct, but I did not check the numbers for this one.

7, your method is correct, but your final answer is off. My calculator gives me vi = 4.76 m/s

Thank you! My mistake on question 7 was I forgot to multiply the 9.8(0.68) by 2 when I moved the 1/2 from the left side to the right side of the equation. I also came up with the answer 4.76 m/s.

On #5 I got the answer a = .57 m/s squared can someone verify this for me.
 
a = 0.56645 m/s^2, so you are correct.
 

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